Analysis On Construction Mechanics Behavior Of Deep Excavation Support System In A Subway

The current scale of under ground engineering has been e xpanding,the construction of excavation engineering conditions are incr easingly complex.Based on the num erical simulation and the measured data,the prediction,correction and prediction of the foundation excavation are carried out by forward and inv erse analysis,the way of dynam ic which focus on the an alysis of the m echanism of construction m echanics,to achieve the construction process risk assessm ent,to achieve the forecast of safety m ethods has becom e the development direction of deep excavation co nstruction design.Thesis com bines a subway deep excavation plan and survey data to build the mechanical model.The residual data of the supporting pile with real-tim e monitoring are taken as the tar get value,and the other unknowns of the surrounding soil and supporting system are obtained by inversion.The mechanism of foundation excavatio n construction process is syst ematically analyzed.The main contents are as follows:(1)This th esis summarizes the applica tion of the lim it equilibrium method,the subgrade reaction m ethod,the numerical analys is method of the plane continuum and the dynamical design theory of deep foundation excavation engineering,and discusses its applicability and characteristics.(2)Combined engineering practice of the f oundation excavation of a subway station,the numerical model of the syner gistic effect between the supporting system and the soil is established,and through the sim ulation of excavation process,the co nstruction mechanics behavior of key components is analyzed.(3)Using the support pile in situ m onitoring data as the known quantities,and calculated the stress of the supporting pile,the internal force of the supporting system and the stress state of the soil and the supporting pile under different working conditions.(4)The deformation of foundation excavation,the earth pressure of retaining pile,the internal force of support system and the stress state of soil and support pile with excavation construction are analyzed,and revealing the mechanism of construction mechanics behavior of foundation excavation engineering.The dynamic analysis method is of great significance to the dynamic control and safety prediction of foundation excavation safety.